Transformer



April 27, 1937.

Filed Allg. 28, 1936 c 57 O @@2008 j. ll M GJM j, w mf 5 IWW /V @MMF fgdod W l @L @y Z Patented Apr 27, 1937 UNITED STATES PATENT OFFICE TRANSFORMER Wilmer J. Leidy, Chicago, Ill., assignor to Chicago Transformer Corporation, Chicago, Ill., a corporation of Illinois Application August 28, 1936, Serial No. 98,289

1 Claim. (Cl. 171-119) This invention relates to transformers and upon a suitable base 5. The transformer laminaparticularly to small transformers having all the tions are clamped together and the entire transleads thereof coming out of one end. Transformer structure is supported on base 5 by means formers of this type, such as, for example, power of bolts lo and nuts Il. The windings of the supply transformers for radio receivers are transformer have a plurality of leads I2 to 2D inusually mounted vertically on a chassis pan. A elusive, for outside connection, projecting through suitable aperture is stamped out of the pan and suitable apertures in the bottom of bell 2.

a portion of the transformer including the wir- As shown in Figure 4, the transformer windings ing leads extends below the top of the chassis pan COrnprise a prirnari7 25 and a seCOnflary 25- Priand into the interior thereof. The transformer is mary 2a has a plurality of taps 25 t0 30 nClulo bolted in this fashion and usually presents a clean sive and end connections I 2 and 3l. Wires 28 to exterior unbroken by any Wiring. Si inclusive are taken out through top bell I.

In the case of radio receivers-and, in fact, in Bell thas an Opening 35111 the top thereof Covered any electrical device employing transformersby an insulating plate riVeted at 3l and 38 the occasion frequently arises when the transtheretO- Plate 55 Carries a plurality 0f pins 45 t0 15 former ratio must be varied. While 110 volts, 60 45 inclusive disposed in a circle over bell opening cycles is the usual standard in this country, there A pin 36 is disposed in the Center thereof. are numerous and varied voltages in other parts It Will be nOted that pin 45 is longer than the oi the World. In a case of this character, particuremaining pinslarly where it is desired to export radio receivers Leads 25 t0 3i inclusive from the transformer of other articles employing a transformer, it is primary are Connected to pins 40 to 45 inclusive. 20 desirable from a, production standpoint to om- A connector lead I3 extends from the bottom of ploy a universal type of transformer which may be the transformer therethrough to the top and is mounted in the apparatus and connected in the connected to Center pin 4susual manner. In the event that the transformer T0 provide a seleCtiVe sWitChing aCtlOn, a rO- 25 ratio must be changed to take care of diiferent tary socket member is prOVided- This Consists 0f voltages, it is desirable that some simple method an insulating disk li5 having a series 0f apertures be available for accomplishing the above. In ort0 54 nCluslVe adapted t0 register With pins der to avoid service difculties, and in order to ilu-45. A central aperture is prOVided t0 regmake it possible for a lay-man to accomplish this, ister with Center pin 45- Sunerpesed above disk es 30 it is necessary that this method be simple and is a smaller insulating disk 55 having apertures fool-proof. Furthermore, it is necessary that this registering With apertures 49 t0 55 inclusive. The method be economical, In additionY it is de.. two disks are retained together by an eyelet 5l sirable that the change be eiected from the expassing thrnugh Central aperture 55 in beth disks. terior of the aperture rather than from any in- Dispusetl in any One Of Outer apertures as 55 is a 35 terior, portion thereof. In the case of a radio re- Contact 58 adapted te receive any one of the pins ceiver, the maze of Wiring in the chassis pan is 5*55- A Similar Curitat 59 is Carried by eyelet such as to preclude the possibility of a fool- 5l at the Center aperture and is adapted t0 reproof and effective Change, Furthermore, by ceive center pin se. Contacts 58 and 59 are conmaking it possible to make the change from the neCted tugethel' at 5ll A Cap 5| Of metal is 40 exterior of the apparatus, it is evident that just adapted t0 cover the entire switching means and prior to final checking, when the radio receivers is retained by upper disk 55 by lneans 0f ears 52. or other devices are stacked, a person can simply Disk 55 is Cut away at 53 t0 Clear ears 52 t0 pergo over the various units and make the necessary mit Cap 5i t0 lle turned 0n 0r Offchanges without turning over of any of the units. An a-irOW iS markfld 0n lOWeI disk 48 at aper- 5 Referring to the drawing, Figure 1 is an illusture 56 to indicate the contact position. Various tration of a transformer employing this invention. numbers may he stamped On insulating rnernber 35 Figure 2 is a plan View looking down upon this at the various pin positions to indicate the voltsame transformer. Figure 3 is a detail of the ages. It is obvious that the transformer ratio may switching means. Figure4 is a circuit diagram of he Changed by pulling up the socket member in 50 the transformer, the position shown in Figure 3, rotating same on Referring to the drawing, a pair of pressed steel the center pin and then pressing down at the deend shields or bells I and 2 are shown. Between sired position. these is a stack of laminations 3 enclosing a plu- This is an ilnplOVenlent 0n Patent 1,988,733 rality of windings. The transformer is mounted granted January 22, 1935. 55

10 said one winding to said pins, a pin carried by said disk at the center of said circle, a lead connected to said central pin and constituting a terminal connector for said one winding, a second disk having apertures therethrough registering with al1 the pins on said first disk, a connecting member disposed in the center aperture and in one of the circularly disposed apertures of said second disk, said second disk being adapted to be telescoped down over the pins of said first disk with the connecting members of said second disk connecting the central pin and one other pin, a cap carried by said second disk and clearing all pins and forming a protecting cover thereover, said central pin being longer than the remaining pins whereby said second disk may be pulled up by holding said cap and rotated to provide a connection between the central pin and any one of the other pins.

WILMER J. LEIDY. 

